锻压技术

影响高强铝合金锻件KIC值的材料及组织因素分析

英文标题：Effect of chemical composition and microstructure on KIC of high strength aluminum alloy forging

作者：彭富华薛凤梅李付国李江顾伟

关键词：7050铝合金锻件断裂韧性微区分析

分类号：TG146.21

出版年,卷(期):页码：2010,35(5):121-126

摘要：

基于高强铝合金自由锻件的研究应用现状，通过对国产锻件的材料因素分析，讨论了高强铝合金国产锻件断裂韧性(K_IC)影响规律的内在和外在因素，并结K_IC合组织因素及微区成分分析，从影响国产7050锻件K_IC的关键因素分析入手，即材料与冶炼因素的分析，来对断裂韧性指标进行综合性评价。研究表明：只有严格控制原材料生产，科学设计锻造和热处理工艺，并调整高强铝合金的强度与塑性指标，使其合理搭配才是提高高强铝合金国产锻件断裂韧性指标的最根本途径。针对国产材料，高强铝合金锻件应考虑维持现有的Cu含量水平下，调整增加Mg含量，同时建议增加Zn含量，并严格控制外来夹杂物的含量、大小和分布。

The effect laws of internal and external factors on fracture toughness (K_IC) of high strength aluminum alloy localization forging were discussed through the chemical composition and microstructure analysis of localization forging, based on the research application status of high strength aluminum alloy free forging. The fracture toughness indexes were evaluated comprehensively from the analysis of major effect factors on K_IC of localization 7050 forging, which were material and smelting factors, and combined with microstructure factors and micro\|area analysis. The reasonable approach to improve the fracture toughness indexes of high strength aluminum alloy localization forging is to strictly control the production of raw material, scientifically design the technology of forging and heat treatment, and regulate the strength and plasticity index of high strength aluminum alloy to make them collocate reasonably. The result shows that for localization forging, it should maintain the content of copper, add the content of magnesium and zinc, and strictly control the content, size and distribution of inclusions.

基金项目：

航空基础科学基金资助项目（03H53048）

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